At minute 28, in this youtube Rothbard says he has a lot of his own sociological laws: ”I have a whole bunch of them, that have evolved over the years…not apodictical laws, as in praxeology,… but a tremendously good empirical generalization with high predictive value.” The particular one mentioned is:
Nobody ever quits.
Most historians don’t know anything about economics and most economists don’t know anything about history.
Walter Block mentions one:
Everyone specializes in what he is worst at.
Walter Block was commenting in his speech at the Mises Institute’s conference in Salamanca on Milton Friedman specializing in money…
I’ll update this list as often as I have other Rothbardian sociological laws and their sources.